An actual efficient way to use this: repair your fabricated tools plus your comp bow with them by putting organic polymer in the fabricator first then regular polymer in case you run out of organic polymer

If instead you have hundreds of stacks from grinding who knows what in an industrial grinder then i'm just gonna assume you are playing on old ark mobile on casual mode so if you are then craft chemistry benches using the organic polymer but you will need 500 metal, 250 cementing paste, 100 sparkpowder, 250 crystal, 250 polymer and 100 electronics per chemistry bench. After crafting them place them down and put something in the inventory of the last one you placed, then demolish them to get 250 regular polymer back per chemistry bench.

If you still have more organic polymer use it to craft soap in a cooking pot by putting 3 organic polymer and 2 oil, to get this back you will have to grind the soap in an industrial grinder but fair warning this will only give you 1 polymer that is still organic back along with 1 oil. Also it will waste gasoline if you grind one so grind 10 at a time